No point in using kph for speed if all of the signs are in mph.
No point in learning C for air temperature if the forecasts are in F.
No point in using metric volume measurements if it doesn't match the measurements on your cooking tools.
No point in using metric height and weight at the doctor if the form requests inches and pounds.
And so on. You just don't have a choice unless the government makes the switch mandatory. So you use it as it comes up: Metric for medicine, for example, but not to figure out your clothing for the day.
No point in using kph for speed if all of the signs are in mph. No point in learning C for air temperature if the forecasts are in F. No point in using metric volume measurements if it doesn't match the measurements on your cooking tools. No point in using metric height and weight at the doctor if the form requests inches and pounds.
And so on. You just don't have a choice unless the government makes the switch mandatory. So you use it as it comes up: Metric for medicine, for example, but not to figure out your clothing for the day.
In Ireland we changed all the road signs to kph 20 years ago. It too some minor adjustments but that was that.